#include <avr/io.h>
#include <util/delay.h>
#include <avr/wdt.h>

int cnt=0;
int vdly=1;

void Delay(int vdly);
int main(void)
  {
    DDRA=0xFF;
    PORTA=0xAA;

    WDTCSR |= (1<<WDCE) | (1<<WDE);
    WDTCSR = (1<<WDE) | (1<<WDP3) | (1<<WDP0);

    while(1)
      {
        PORTA=~cnt++;
        Delay(vdly++);
        __asm__ __volatile__ ("wdr"); // wdt_reset();
      }
  }

void Delay(int vdly) 
  {
  while(vdly--)
    {
      _delay_ms(100);
    }
  }